public void DocumentShouldBeSaved() { // Arrange var doc = new OfficeDocument(this.sourceFile); var viewModel = new OfficeDocumentViewModel(doc); viewModel.InsertPart(XmlParts.RibbonX12); Assume.That(File.Exists(this.destFile), Is.False, "File was not deleted before test"); // Act doc.Save(this.destFile); // Assert Assert.IsTrue(File.Exists(this.destFile), "File was not saved"); }